658261998 has 64 divisors (see below), whose sum is σ = 1598883840. Its totient is φ = 199843200.

The previous prime is 658261993. The next prime is 658261999. The reversal of 658261998 is 899162856.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (658261993) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16893 + ... + 40023.

It is an arithmetic number, because the mean of its divisors is an integer number (24982560).

Almost surely, 2^658261998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 658261998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (799441920).

658261998 is an abundant number, since it is smaller than the sum of its proper divisors (940621842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

658261998 is a wasteful number, since it uses less digits than its factorization.

658261998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23190 (or 23184 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The square root of 658261998 is about 25656.6170412235. The cubic root of 658261998 is about 869.8938514965.

The spelling of 658261998 in words is "six hundred fifty-eight million, two hundred sixty-one thousand, nine hundred ninety-eight".